161456305 has 4 divisors (see below), whose sum is σ = 193747572. Its totient is φ = 129165040.

The previous prime is 161456303. The next prime is 161456341. The reversal of 161456305 is 503654161.

161456305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503654161 = 23 ⋅21898007.

It can be written as a sum of positive squares in 2 ways, for example, as 35141184 + 126315121 = 5928^2 + 11239^2 .

It is not a de Polignac number, because 161456305 - 2¹ = 161456303 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161456303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16145626 + ... + 16145635.

It is an arithmetic number, because the mean of its divisors is an integer number (48436893).

Almost surely, 2^161456305 is an apocalyptic number.

It is an amenable number.

161456305 is a deficient number, since it is larger than the sum of its proper divisors (32291267).

161456305 is an equidigital number, since it uses as much as digits as its factorization.

161456305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32291266.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 161456305 is about 12706.5457540592. The cubic root of 161456305 is about 544.5256428558.

The spelling of 161456305 in words is "one hundred sixty-one million, four hundred fifty-six thousand, three hundred five".